Update Dockerfile

Signed-off-by: techopsmasters <163403479+techopsmasters@users.noreply.github.com>

react-express-mongodb/frontend/Dockerfile

@@ -26,16 +26,12 @@ EXPOSE 3000
 CMD ["npm", "start"]
 
 FROM development as dev-envs
-RUN <<EOF
-apt-get update
-apt-get install -y --no-install-recommends git
-EOF
-
-RUN <<EOF
-useradd -s /bin/bash -m vscode
-groupadd docker
-usermod -aG docker vscode
-EOF
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends git
+
+RUN useradd -s /bin/bash -m vscode && \
+    groupadd docker && \
+    usermod -aG docker vscode
 # install Docker tools (cli, buildx, compose)
 COPY --from=gloursdocker/docker / /
 CMD [ "npm", "start" ]